TM 10-6640-238-13 3-11 Table 3-2.  Troubleshooting - continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 38. OXYGEN STABILITY BATH FAILS TO OPERATE. Step 1.    Check the 3-position heat switch. Place switch in the HIGH HEAT position. Step 2.    Check and reset MAIN POWER PANEL circuit breaker A1CB15. If bath still fails to operate, notify unit maintenance. 39. LABORATORY OVEN FAILS TO OPERATE, DOES NOT HEAT. Step 1.    Ensure that unit’s power cord is plugged into convenience outlet. Step 2.    Check position of line switch. Place line switch ON. Step 3.    Check and reset MAIN POWER PANEL circuit breaker A1CB5. If oven still fails to operate, notify unit maintenance. 40. BURN-OUT FURNACE FAILS TO HEAT. POWER SWITCH ON, BUT POWER SWITCH LIGHT NOT ILLUMINATED. Step 1.    Ensure that unit’s power cord is plugged into convenience outlet. Step 2.    Check and reset MAIN POWER PANEL circuit breaker A1CB12. If furnace still fails to heat, notify unit maintenance. 41. BURN-OUT FURNACE FAILS TO HEAT. POWER SWITCH ON, POWER SWITCH LIGHT ILLUMINATED, BUT CYCLE LIGHT NOT ILLUMINATED. Ensure door is completely closed. If furnace still fails to heat, notify unit maintenance. 42. REFRIGERATOR FAILS TO OPERATE. Step 1.    Ensure that unit’s power cord is plugged into convenience outlet. Step 2.    Check and reset MAIN POWER PANEL circuit breaker A1CB6. If refrigerator still fails to operate, notify unit maintenance. 43. JET FUEL THERMAL OXIDATION TESTER (JFTOT) FAILS TO OPERATE. POWER SWITCH ON, BUT RED POWER INDICATOR AND CABINET LIGHTS NOT ILLUMINATED. Step 1.    Ensure that unit’s power cord is plugged into convenience outlet. Step 2.    Check and reset MAIN POWER PANEL circuit breaker A1CB3. Step 3.    Check convenience outlet. If JFTOT still fails to operate, notify unit maintenance.